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Graph4Cache:一种用于缓存预取的图神经网络模型

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计算机研究与发展 2024年第8期61卷 1945-1956页

作者：尚晶武智晖肖智文张逸飞中国移动信息技术中心北京100033 中移动信息技术有限公司北京100033

大多数计算系统利用缓存来减少数据访问时间,加快数据处理并平衡服务负载.缓存管理的关键在于确定即将被加载到缓存中或从缓存中丢弃的合适数据,以及进行缓存置换的合适时机,这对于提高缓存命中率至关重要.现有的缓存方案面临2个问题:... 详细信息

大多数计算系统利用缓存来减少数据访问时间,加快数据处理并平衡服务负载.缓存管理的关键在于确定即将被加载到缓存中或从缓存中丢弃的合适数据,以及进行缓存置换的合适时机,这对于提高缓存命中率至关重要.现有的缓存方案面临2个问题:在实时的、在线的缓存场景下难以洞察用户访问数据的热度信息,以及忽略了数据访问序列之间复杂的高阶信息.提出了一个基于GNN的缓存预取网络Graph4Cache.通过将单个访问序列建模为有向图(ASGraph),并引入虚拟节点聚合图中所有节点的信息和表示整个序列.然后由ASGraph的虚拟节点构造一个跨序列无向图(CSGraph)来学习跨序列特征,这极大地丰富了单个序列中有限的数据项转换模式.通过融合这2种图结构的信息,学习到了序列之间的高阶关联信息,并获取了丰富的用户意图.在多个公共数据集上的实验结果证明了该方法的有效性.Graph4Cache在P@20和MRR@20上均优于现有的缓存预测算法.

关键词：图神经网络缓存预取访问序列图跨序列图缓存预测

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栅格DEM山顶点提取的坡向分布特征法

武汉大学学报（信息科学版） 2024年第3期49卷 419-425页

作者：周访滨肖智文刘学军马国伟张珊珊长沙理工大学交通运输工程学院湖南长沙410114 长沙理工大学特殊环境道路工程湖南省重点实验室湖南长沙410114 南京师范大学地理科学学院江苏南京210023 云南省交通规划设计研究院有限公司云南昆明650041

山顶点提取方法决定着山体部位划分结果的正确性和微地形自动分类效率。以高程和等高线为参考提取山顶点的方法存在伪山顶点剔除不完全和局部山顶点丢失的问题,依据山顶点邻域坡向呈均匀分布规律,提出了基于坡向分布特征的山顶点提取方... 详细信息

山顶点提取方法决定着山体部位划分结果的正确性和微地形自动分类效率。以高程和等高线为参考提取山顶点的方法存在伪山顶点剔除不完全和局部山顶点丢失的问题,依据山顶点邻域坡向呈均匀分布规律,提出了基于坡向分布特征的山顶点提取方法,构建了以山顶点为中心的邻域坡向顺时针逐渐递增模型,并以山脊线拟合和深度优先搜索(depth first search,DFS)算法的递推思想,剔除提取结果中的伪山顶点。顾及实体数字高程模型(digital elevation model,DEM)地形破碎对提取方法的影响,采用了模拟DEM和实体DEM分别进行实验和分析。实验结果表明,坡向分布特征法避免了传统基于封闭等高线提取山顶点时主观选取阈值的不确定性;模拟DEM因其连续、光滑,山顶点提取准确率可达到100%,而实体DEM沿用模拟DEM机制,因其地形破碎导致的不可适性,通过调整坡向分布约束条件可予以改善,实验提取准确率平均可达到96.1%。

关键词：数字地形分析栅格DEM 坡向山顶点分布特征

A cooperative detection game:UAV swarm *** fast intruder

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Journal of Systems Engineering and Electronics 2023年第6期34卷 1565-1575页

作者： xiao zhiwen FU xiaowei School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710129China

This paper studies a special defense game using unmanned aerial vehicle(UAV)swarm against a fast *** fast intruder applies an offensive strategy based on the artificial potential field method and Apollonius circle to scout a certain *** defenders,the UAVs are arranged into three layers:the forward layer,the midfield layer and the back *** co-defense mechanism,including the role derivation method of UAV swarm and a guidance law based on the co-defense front point,is introduced for UAV swarm to co-detect the ***,five formations are designed for comparative analysis when ten UAVs are *** Monte Carlo experiments and ablation experiment,the effectiveness of the proposed co-defense method has been verified.

关键词： cooperative detection game unmanned aerial vehicle(UAV)swarm fast intruder defensive strategy co-defense mechanism.

时移世易:城市迁移经历与公平感知——来自CGSS的经验证据

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武汉科技大学学报（社会科学版） 2024年第3期26卷 51-62页

作者：肖志文刘爱玉北京大学光华管理学院北京100871 北京大学社会学系北京100871

本研究从“时-空”二元路径出发,基于中国综合社会调查(CGSS)数据,考察个体的迁移经历对其公平感知的影响。研究发现,基于社会空间的变迁和参照系统的复杂化,迁移经历将使个体感受到相对剥夺,进而使结果公平认知下降;基于空间转换后在... 详细信息

本研究从“时-空”二元路径出发,基于中国综合社会调查(CGSS)数据,考察个体的迁移经历对其公平感知的影响。研究发现,基于社会空间的变迁和参照系统的复杂化,迁移经历将使个体感受到相对剥夺,进而使结果公平认知下降;基于空间转换后在流入地面临的制度性与社会性偏见,迁移经历将显著降低个体的机会公平认知,而伴随时间变化的自我参照对改善公平认知所带来的积极效应微乎其微。作为一个整合性的分析框架,“时-空”二元机制对迁移经历-主观态度变迁的考察具有启发性,与此同时,本研究也有助于厘清流动人口的心理认知与精神空间,并为促进社会融合、构建和谐社会提供学理支持。

关键词：迁移经历结果公平机会公平户口时空机制

Low-rank tensor completion with spatial-spectral consistency for hyperspectral image restoration

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光电子快报:英文版 2023年第7期19卷 432-436页

作者： xiao zhiwen ZHU Hu School of Communications and Information Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China

Hyperspectral image(HSI) restoration has been widely used to improve the quality of *** are often impacted by various degradations,such as noise and deadlines,which have a bad visual effect and influence the subsequent *** HSIs with missing data,most tensor regularized methods cannot complete missing data and restore *** propose a spatial-spectral consistency regularized low-rank tensor completion(SSC-LRTC) model for removing noise and recovering HSI data,in which an SSC regularization is proposed considering the images of different bands are different from each ***,the proposed method is solved by a convergent multi-block alternating direction method of multipliers(ADMM) algorithm,and convergence of the solution is *** superiority of the proposed model on HSI restoration is demonstrated by experiments on removing various noises and deadlines.

关键词： tensor consistency removing

Power Source Flexibility Margin Quantification Method for Multi-energy Power Systems Based on Blind Number Theory

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CSEE Journal of Power and Energy Systems 2023年第6期9卷 2321-2331页

作者： Bai xiao Jialiang Wang zhiwen xiao Gangui Yan Ling Dong Maochun Wang Hongzhi Yang the Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education(Northeast Electric Power University)Jilin 132012China Chengde Power Supply Company State Grid Jibei Electric Power CompanyChengde 067000China State Grid Qinghai Electric Power Company Xining 810008China

The grid connection of a high proportion of re-newable energy generation increases the uncertainty in power ***,the flexibility margin of different energy sources needs to be quantified to cope with the uncertainty change and maintain the dynamic balance of power system *** this paper,first,the flexibility characteristics of source,net,load and power and load community(PLC)are *** dynamic equilibrium relationship among them is briefly ***,taking into full consideration the complex output characteristics of different energy sources and combining their respective flexibility characteristics,a quantitative model of the power source flexibility margin for thermal power,hydro-power,gas power and concentrating solar power is established.A quantitative model for a power source flexibility margin in PV and wind power based on blind number theory is ***,the calculation method of theoretical power generation capacity,which can reflect different characteristics of output power of various energy sources,is *** actual output power of each power source in each period is ***,a case study shows that the model and method can consider the operating characteristics of different types of power sources,and quickly and accurately quantify the adjustable range of flexibility margins of each power source at different periods of time,which can provide an important basis for evaluating the capacity of renewable energy consumption and the optimal operation of multi-energy power systems(MEPSs).

关键词： Load forecasting multi-energy power system power generation capacity power source flexibility margin

基于Prewitt算子和Radon变换的雷达高速微弱目标检测

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电光与控制 2024年第6期31卷 101-104,111页

作者：杨勇军肖志文常明张茂龙于斯扬空军通信士官学校辽宁大连116000

正交频分复用(OFDM)调制雷达中跨距离单元走动问题降低了高速微弱目标检测性能,为此,提出一种基于Prewitt算子和Radon变换的OFDM雷达高速微弱目标检测算法。首先分析了多脉冲积累出现的跨距离单元走动以及Radon变换受噪声干扰问题,然后... 详细信息

正交频分复用(OFDM)调制雷达中跨距离单元走动问题降低了高速微弱目标检测性能,为此,提出一种基于Prewitt算子和Radon变换的OFDM雷达高速微弱目标检测算法。首先分析了多脉冲积累出现的跨距离单元走动以及Radon变换受噪声干扰问题,然后采用Prewitt算子卷积运算抑制噪声并保留回波能量,采用Radon变换沿距离单元走动斜线进行能量积累。理论分析和仿真结果表明,该算法具有比Hough变换和动目标检测(MTD)更优的低信噪比背景下的高速微弱目标检测性能,并能有效实现多目标检测。

关键词：正交频分复用调制雷达跨距离单元走动高速微弱目标 Prewitt算子 Radon变换多目标检测

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面向广域分布式计算环境的任务与资源动态双向匹配方法

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大数据 2024年第4期10卷 51-65页

作者：尚晶肖利民肖智文王锦权武智晖李辉阳张逸飞宋尧王冀彬中移动信息技术有限公司北京100033 复杂关键软件环境全国重点实验室北京100191 北京航空航天大学计算机学院北京100191 中国信息通信研究院北京100191

广域分布式计算环境可提供大规模的计算和存储资源,是支持算力互联和数据流转的重要基础设施。在广域分布式计算环境中,任务与资源的匹配对于提高系统性能具有重要意义。然而,任务与资源的多样性、地理位置分散的资源会增加二者匹配的... 详细信息

广域分布式计算环境可提供大规模的计算和存储资源,是支持算力互联和数据流转的重要基础设施。在广域分布式计算环境中,任务与资源的匹配对于提高系统性能具有重要意义。然而,任务与资源的多样性、地理位置分散的资源会增加二者匹配的复杂性。针对响应延迟高、匹配效率低等问题,提出了面向广域分布式计算环境的任务与资源动态匹配方法,通过建立统一的任务需求模型和资源能力模型来简化匹配过程,降低响应延迟。此外,定义了任务向匹配度和资源向匹配度以刻画任务视角和资源视角的偏好,并权衡二者;定义了任务和资源的双向综合匹配度以量化任务需求和资源能力的适配程度。最后通过动态计算每一组任务与资源间的双向综合匹配度以优化匹配效果。实验结果表明,与现有的方法相比,该方法可提升匹配效果,并大幅降低平均响应延迟。

关键词：广域协同调度资源匹配双向匹配广域分布式计算环境

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CT VIRTUAL ENDOSCOPY IN ASSESSING OSSICULAR CHAIN DISRUPTION CSUSED BY TEMPORAL BONE FRACTURE AND EAR TRAUMA

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Journal of Otology 2013年第2期8卷 104-111页

作者： Jiang Lixin xiao zhiwen Department of 0torhinolaryngology Head and Neck Surgery The First Affiliated Hospital of Jinan University 510632

Objective To explore the value of computed tomography virtual endoscopy(VE) in assessing ossicular chain disruption in temporal bone fracture and ear trauma with intact tympanum. Methods High resolution spiral computerized tomography(CT) was completed in 35 cases of temporal bone fracture and 5 cases of tympanum trauma, all with intact or healed tympanum. Three-dimensional reconstruction was completed using a virtual endoscopy software. Audiological tests were conducted in all patients and evaluation of facial nerve injury in patients with facial paralysis. Patients with mild conductive deafness, ossicular chain subluxation on VE, and no facial paralysis were treated conservatively for 4-12 weeks with repeated hearing evaluation; those with facial paralysis underwent surgery if no recovery after 4- 8 weeks of conservative treatment. Patients with moderate to severe conductive hearing loss or mixed hearing loss, incus long process fracture or dislocation on VE and facial paralysis, underwent ossicular chain reconstruction and facial nerve decompression after conservative treatment for 4-8 weeks, or exploratory tympanotomy only if no facial paralysis. VE, audiological tests and facial nerve function tests were repeated in 3-6 months after surgery. Results Of the 6 cases with mild conductive hearing loss, ossicular chain subluxation and no facial paralysis, 3recovered to normal hearing spontaneously and 3 showed no significant improvement, after 4-12 weeks of conservative treatment. After conservative treatment for 4-8 weeks, 3 of the 12 cases with mild conductive deafness, ossicular chain dislocation on VE and facial paralysis recovered to normal hearing and HouseBrackmann(HB) grade I facial function from HB grade II,4 showed facial function recovery to HB grade I(n=2) or II(n=2) from HB grade III but no hearing recovery, and 5 gained no recovery and went on to receive exploratory tympanotomy and facial nerve decompression. The 11 cases with moderate to severe conduct

关键词： temporal bone fracture ear trauma virtual CT endoscopy(VE) computerized tomography(CT) ossicular chain disruption